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1. This could be due to several things. a. The power supply for the external drive is not working properlyb. A broken power supply connector.c. The USB drive was disconnected improperly > that is not disconnected safely in Windows d. The external drive controller in the USB case is defective. A new case is needed.

try to disable all firewall setings or antivirus...after try accesing frome ur command prompe if u can that the windows is blocking the hdd...uninstall any new software or driver and try again...no effect ok dowload ophcrack live cd frome google and access the hdd by force repare or scan it in surface scan that will fix ur clusters problems that might be in the back off this prob an du know wer e2 go frome there